Your vet may give more antibiotics but they will still probably give your kitty diarrhea for a brief time. Some illnesses aren't UTI's of course, and some are viral. You can only use antibiotics to treat secondary infections when this is the case (with feline herpes which is a virus for example).
Make sure kitty is up-to-date on all shots as soon as the vet thinks it's wise. Some things like FIV, etc can be transmitted in kennels, shelters, etc.
If this is a recurring UTI, make sure you keep kitty hydrated, have a urinalysis done by the vet and a CBC. Make sure to feed her only wet food that is Grain Free and as close to 40% animal protein as you can get. Dry food keeps your cat in a state of chronic dehydration, causing constipation, diarrhea, kidney damage over time, etc. You should also keep litterboxes scooped daily, and have one litter box per cat you have, plus an extra so they are not struggling to hold it at any given time.
Provide fresh water in clean bowls in at least 2 places in your home, and also consider a water fountain with a filter.
I see that you're taking kitty to the vet, as a recurring UTI can cause kidney damage. Good move.